fix: check whether it's undefined #5970

Job	Run time
Build / Build	2m 48s
Test API / API Test Local	2m 48s
Test Agent Local / test_agent_local	2m 47s
Test Packages / Test ./internal/billing	1m 50s
Test Packages / Test ./internal/encryption	2m 6s
Test Packages / Test ./internal/hash	1m 51s
Test Packages / Test ./internal/id	1m 51s
Test Packages / Test ./internal/keys	1m 48s
Test Packages / Test ./internal/resend	1m 44s
Test Packages / Test ./internal/clickhouse	2m 47s
Test Packages / Test ./packages/api	2m 29s
Test Packages / Test ./packages/cache	2m 20s
Test Packages / Test ./packages/hono	2m 13s
Test Packages / Test ./packages/nextjs	2m 14s
Test Packages / Test ./packages/rbac	2m 41s
	34m 17s

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